CN117587461A - Production process for recycling sodium sulfate from lead ingot prepared from lead plaster - Google Patents
Production process for recycling sodium sulfate from lead ingot prepared from lead plaster Download PDFInfo
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- CN117587461A CN117587461A CN202311547092.0A CN202311547092A CN117587461A CN 117587461 A CN117587461 A CN 117587461A CN 202311547092 A CN202311547092 A CN 202311547092A CN 117587461 A CN117587461 A CN 117587461A
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- lead
- lead plaster
- plaster
- sodium sulfate
- production process
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- 239000011505 plaster Substances 0.000 title claims abstract description 59
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 title claims abstract description 24
- 229910052938 sodium sulfate Inorganic materials 0.000 title claims abstract description 24
- 235000011152 sodium sulphate Nutrition 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 238000004064 recycling Methods 0.000 title claims abstract description 21
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 title claims description 6
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 25
- 230000023556 desulfurization Effects 0.000 claims abstract description 25
- 239000002002 slurry Substances 0.000 claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 239000002699 waste material Substances 0.000 claims abstract description 19
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 17
- 230000009467 reduction Effects 0.000 claims abstract description 11
- 238000003825 pressing Methods 0.000 claims abstract description 10
- 238000012216 screening Methods 0.000 claims abstract description 10
- 238000003860 storage Methods 0.000 claims abstract description 10
- 239000007790 solid phase Substances 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 8
- 239000003365 glass fiber Substances 0.000 claims abstract description 6
- 238000005192 partition Methods 0.000 claims abstract description 6
- 238000001125 extrusion Methods 0.000 claims abstract description 5
- -1 filter pressing Substances 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000004806 packaging method and process Methods 0.000 claims abstract description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 19
- PIJPYDMVFNTHIP-UHFFFAOYSA-L lead sulfate Chemical compound [PbH4+2].[O-]S([O-])(=O)=O PIJPYDMVFNTHIP-UHFFFAOYSA-L 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 15
- 229910021514 lead(II) hydroxide Inorganic materials 0.000 claims description 13
- HTUMBQDCCIXGCV-UHFFFAOYSA-N lead oxide Chemical compound [O-2].[Pb+2] HTUMBQDCCIXGCV-UHFFFAOYSA-N 0.000 claims description 9
- YADSGOSSYOOKMP-UHFFFAOYSA-N dioxolead Chemical compound O=[Pb]=O YADSGOSSYOOKMP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 6
- 229910000464 lead oxide Inorganic materials 0.000 claims description 6
- 230000035484 reaction time Effects 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 claims description 3
- 238000009835 boiling Methods 0.000 claims description 3
- 238000003490 calendering Methods 0.000 claims description 3
- 238000002425 crystallisation Methods 0.000 claims description 3
- 230000008025 crystallization Effects 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- MYHXWQZHYLEHIU-UHFFFAOYSA-N oxalic acid;sulfuric acid Chemical compound OS(O)(=O)=O.OC(=O)C(O)=O MYHXWQZHYLEHIU-UHFFFAOYSA-N 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 239000000779 smoke Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 abstract 1
- 239000003344 environmental pollutant Substances 0.000 description 5
- 231100000719 pollutant Toxicity 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 239000003595 mist Substances 0.000 description 4
- 238000005245 sintering Methods 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000011085 pressure filtration Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000009270 solid waste treatment Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001698 pyrogenic effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/54—Reclaiming serviceable parts of waste accumulators
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/16—Purification
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
- C25C1/18—Electrolytic production, recovery or refining of metals by electrolysis of solutions of lead
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- General Chemical & Material Sciences (AREA)
- Metallurgy (AREA)
- Inorganic Chemistry (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a production process for recycling sodium sulfate from lead ingots prepared from lead plaster, which comprises the steps of fine screening of separated lead plaster slurry, reduction and conversion of lead plaster, pre-desulfurization of lead plaster, forced update desulfurization of lead plaster, filter pressing, solid phase electrolysis, heating in a low-temperature pot, ingot preparation by a hydraulic extrusion machine and packaging; the fine screening of the lead plaster slurry comprises the following steps: waste lead paste obtained by crushing and sorting the waste maintenance-free lead storage batteries is separated from large-size impurities of the waste glass fiber partition plates by using the geometric size difference of substances through a 200-mesh vibration fine sorting screen, so that cleaner lead paste slurry is obtained. The production process for recycling sodium sulfate from lead ingots prepared from lead plaster has the advantages of small influence on surrounding environment and high recycling efficiency.
Description
Technical Field
The invention relates to the technical field of lead recovery, in particular to a production process for recovering sodium sulfate from lead ingots prepared from lead paste.
Background
The lead storage battery is still dominant in the use of the automobile battery, a large amount of lead storage battery is disposed of by burying, burning and other means every year, the environment is polluted and resources are wasted, lead blocks in the lead storage battery and a battery plastic shell are recyclable resources, a pyrogenic recovery mode currently exists, namely, the waste lead storage battery is thrown out of electrolyte and then is thrown into an incinerator for burning and then is recycled, but the method has the common defect that the plastic shells are burned together to form waste, and a large amount of lead storage battery is thrown into one incinerator at the same time, so that the situation that sintering is unbalanced and excessive sintering occurs is avoided, a large amount of sulfur dioxide-containing hot gas is generated in the sintering process to enter the atmosphere, and the pollution is caused to the local environment.
Disclosure of Invention
The invention aims at solving the problems and needs to provide a production process for recycling sodium sulfate from lead ingots made of lead plaster, which solves the problems in the prior art.
The invention provides a production process for recycling sodium sulfate from lead ingots prepared from lead paste, which comprises the following steps:
fine screening of the separated lead plaster slurry, reduction and conversion of the lead plaster, pre-desulfurization of the lead plaster, forced update desulfurization of the lead plaster, filter pressing, solid-phase electrolysis, heating in a low-temperature pot, ingot making by a hydraulic extrusion machine and packaging;
the fine screening of the lead plaster slurry comprises the following steps: waste lead paste obtained by crushing and sorting the waste maintenance-free lead storage batteries is separated from large-size impurities of the waste glass fiber partition plates by using the geometric size difference of substances through a 200-mesh vibration fine sorting screen, so that cleaner lead paste slurry is obtained.
Preferably, the lead plaster reduction conversion conveys lead plaster slurry to a reduction conversion reaction kettle, oxalic acid-sulfuric acid is added, the pH value is controlled to be between 2 and 4, and stirring is continued; the lead dioxide is converted into lead sulfate, and the reaction time is about 1h;
the chemical reaction equation is:
PbO 2 +H 2 C 2 O 4 +H 2 SO 4 ＝PbSO 4 +2H 2 O+2CO 2 。
preferably, the lead sulfate slurry enters a desulfurization reaction kettle, sodium hydroxide is added to adjust the pH to 8-10, stirring is continuously carried out at normal temperature and normal pressure, and the lead sulfate reacts with the sodium hydroxide.
Preferably, the lead hydroxide which is a desulfurization product generated in the desulfurization process is easy to wrap the surface of the lead sulfate to form a shell layer, so that the lead sulfate is prevented from further contact with sodium hydroxide to form a mass transfer barrier, the lead sulfate is not thoroughly reacted, the lead plaster is forcedly updated and desulfurized, the shell surface is forcedly updated and timely ground by adopting compressed air, the shell layer of the product is damaged, the surface update of reaction particles is realized, the reaction time is about 30-40min, and at the moment, the solid substance in the solution is lead hydroxide; the pH value is kept between 8 and 10 in the lead plaster desulfurization process.
Preferably, the filter pressing comprises the step of pumping the slurry completely reacted in the lead plaster desulfurization reaction kettle into a high-pressure plate-and-frame filter press by a pump to filter, and conveying the sodium sulfate-containing solution into a crystallization process by a pipeline, wherein lead hydroxide solids remain in the plate-and-frame filter press to complete solid-liquid separation.
Preferably, the solid-phase electrolysis comprises placing lead hydroxide after pressure filtration on a grid plate of a stainless steel cabinet-type cathode frame, wherein an anode is a stainless steel plate, and conducting electrolysis by passing constant-voltage current-limiting direct current into 60-150 g/L sodium hydroxide solution, wherein the temperature is kept at 50-70 ℃, and the constant voltage value is 1.7-2.5V; the constant voltage electrolysis current is increased from small to peak value, gradually decreases to be stable, and under the condition that the electrolysis parameters are basically unchanged, the current is reduced to 15-35% of the peak value, hydrogen bubbles appear on the surface of cathode lead, and the end point can be judged; taking out the cathode frame, and discharging the reduced lead powder; the electrolytic reaction principle is as follows:
and (3) cathode: 2Pb (OH) 2 +4e＝2Pb+4OH - E 0 ＝-0.516V
Anode: 4OH - -4 e ＝O 2 +2H 2 O E 0 ＝0.401V。
Preferably, the low-temperature pot heating comprises the steps of controlling the heating temperature to be 326-340 ℃ and slightly higher than the melting point of 327 ℃ for 0.5h, heating the electrolytic lead in the low-temperature pot to a molten (softened) state, wherein the boiling point of lead is 1750 ℃, lead vapor escapes when the low-temperature pot is heated to 400-500 ℃, the lead vapor is rapidly oxidized into lead oxide smoke in the air, the maximum heating temperature of the low-temperature pot is 340 ℃, the heating time is 0.5h, and the electrolytic lead in the pot is in the molten (softened) state and has little lead oxide dust.
Preferably, the hydraulic extruder is controlled by a spindle: and (3) feeding the heated and melted (softened) electrolytic lead into a die from the bottom of the low-temperature pot, and conveying the die to a hydraulic extruder for calendaring to obtain lead ingots.
The invention has the advantages and beneficial effects that:
the invention provides a production process for recycling sodium sulfate from lead ingots prepared from lead paste, which comprises the following steps: fine screening of the separated lead plaster slurry, reduction and conversion of the lead plaster, pre-desulfurization of the lead plaster, forced update desulfurization of the lead plaster, filter pressing, solid-phase electrolysis, heating in a low-temperature pot, ingot making by a hydraulic extrusion machine and packaging; the fine screening of the lead plaster slurry comprises the following steps: waste lead paste obtained by crushing and sorting the waste maintenance-free lead storage batteries is separated from large-size impurities of the waste glass fiber partition plates by using the geometric size difference of substances through a 200-mesh vibration fine sorting screen, so that cleaner lead paste slurry is obtained.
The production process for recycling sodium sulfate from lead ingots prepared from lead plaster has the advantages of small influence on surrounding environment and high recycling efficiency. The method reduces the emission of sulfuric acid mist, lead dust and TSP in an unorganized way, optimizes the existing engineering solid waste treatment mode, and reduces the solid waste production and the possible environmental influence degree.
Drawings
Fig. 1 is a schematic flow chart of the present invention.
Detailed Description
Referring to fig. 1, the invention provides a production process for recovering sodium sulfate from lead ingots made of lead plaster, which comprises the following steps:
fine screening of the separated lead plaster slurry, reduction and conversion of the lead plaster, pre-desulfurization of the lead plaster, forced update desulfurization of the lead plaster, filter pressing, solid-phase electrolysis, heating in a low-temperature pot, ingot making by a hydraulic extrusion machine and packaging;
the fine screening of the lead plaster slurry comprises the following steps: waste lead paste obtained by crushing and sorting the waste maintenance-free lead storage batteries is separated from large-size impurities of the waste glass fiber partition boards by using the geometric size difference of substances through a 200-mesh vibration fine sorting screen, so that cleaner lead paste slurry is obtained, and the waste in the process is waste glass fiber partition board solid waste.
In one embodiment, the lead plaster reduction conversion conveys lead plaster slurry to a reduction conversion reaction kettle, oxalic acid-sulfuric acid is added, the pH value is controlled to be between 2 and 4, and stirring is continued; the lead dioxide is converted into lead sulfate, and the reaction time is about 1h; the pollutant generated in this procedure is mainly acid mist and noise.
The chemical reaction equation is:
PbO 2 +H 2 C 2 O 4 +H 2 SO 4 ＝PbSO 4 +2H 2 O+2CO 2 。
the lead sulfate slurry enters a desulfurization reaction kettle, sodium hydroxide is added to adjust the pH to 8-10, stirring is continuously carried out at normal temperature and normal pressure, and the lead sulfate reacts with the sodium hydroxide.
In one embodiment, the lead hydroxide which is a desulfurization product generated in the desulfurization process is easy to wrap the surface of the lead sulfate to form a shell layer, so that the lead sulfate is prevented from further contact with sodium hydroxide to form a mass transfer barrier, the lead sulfate is not thoroughly reacted, the lead plaster is forcedly updated and desulfurized, the shell surface is forcedly updated and timely updated by grinding the shell surface by adopting compressed air, the shell layer of the product is destroyed, the surface update of reaction particles is realized, the reaction time is about 30-40min, and at the moment, the solid substance in the solution is the lead hydroxide; when the pH is more than 10, lead hydroxide is gradually dissolved to generate lead salt, so that the pH is required to be kept between 8 and 10 in the desulfurization process of the lead plaster, and pollutants mainly are noise generated in the process.
In one embodiment, the filter pressing comprises pumping the slurry completely reacted in the lead plaster desulfurization reaction kettle into a high-pressure plate-and-frame filter press by a pump for filter pressing, conveying the sodium sulfate-containing solution into a crystallization process by a pipeline, and leaving lead hydroxide solids in the plate-and-frame filter press for solid-liquid separation, wherein pollutants generated in the process are mainly alkali mist.
In one embodiment, the solid-phase electrolysis comprises placing lead hydroxide after pressure filtration on a grid plate of a stainless steel cabinet cathode frame, wherein an anode is a stainless steel plate, and conducting electrolysis by passing constant-voltage current-limiting direct current into 60-150 g/L sodium hydroxide solution, wherein the temperature is kept at 50-70 ℃, and the constant voltage value is 1.7-2.5V; the constant voltage electrolysis current is increased from small to peak value, gradually decreases to be stable, and under the condition that the electrolysis parameters are basically unchanged, the current is reduced to 15-35% of the peak value, hydrogen bubbles appear on the surface of cathode lead, and the end point can be judged; taking out the cathode frame, and discharging the reduced lead powder; the electrolytic reaction principle is as follows:
and (3) cathode: 2Pb (OH) 2 +4e＝2Pb+4OH - E 0 ＝-0.516V
Anode: 4OH - -4 e ＝O 2 +2H 2 O E 0 ＝0.401V
The pollutant generated in the process is mainly lead volatilized by heating and compound dust generated by the lead volatilized by heating.
In one embodiment, the cryopan heating comprises: the heating temperature is controlled to be 326-340 ℃ and slightly higher than the melting point of 327 ℃ for 0.5h, the electrolytic lead in the low-temperature pot is heated to be in a molten (softened) state, the boiling point of the lead is 1750 ℃, lead vapor escapes when the low-temperature pot is heated to 400-500 ℃, the lead vapor is rapidly oxidized into lead oxide smoke in the air, the highest heating temperature of the item is 340 ℃, the heating time is 0.5h, the electrolytic lead in the pot is in the molten (softened) state, and a small amount of lead oxide dust is generated, and the main pollutant generated in the process is the running noise of equipment.
In one embodiment, the hydraulic extruder is spindle controlled: and (3) feeding the heated and melted (softened) electrolytic lead into a die from the bottom of the low-temperature pot, and conveying the die to a hydraulic extruder for calendaring to obtain lead ingots.
By adopting the production process for recycling sodium sulfate from lead ingots prepared by lead plaster, the material balance table of lead ingots prepared by lead plaster comprises the following steps:
the production process for recovering sodium sulfate by lead ingot prepared by lead plaster of the invention comprises the following steps of:
the production process for recycling sodium sulfate from lead ingots prepared from lead plaster has the advantages of small influence on surrounding environment and high recycling efficiency. The method reduces the emission of sulfuric acid mist, lead dust and TSP in an unorganized way, optimizes the existing engineering solid waste treatment mode, and reduces the solid waste production and the possible environmental influence degree.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features of the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description. The foregoing examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the invention.
Claims (8)
1. The production process for recycling sodium sulfate from lead ingots prepared by lead plaster is characterized by comprising the following steps of:
fine screening of the separated lead plaster slurry, reduction and conversion of the lead plaster, pre-desulfurization of the lead plaster, forced update desulfurization of the lead plaster, filter pressing, solid-phase electrolysis, heating in a low-temperature pot, ingot making by a hydraulic extrusion machine and packaging;
the fine screening of the lead plaster slurry comprises the following steps: waste lead paste obtained by crushing and sorting the waste maintenance-free lead storage batteries is separated from large-size impurities of the waste glass fiber partition plates by using the geometric size difference of substances through a 200-mesh vibration fine sorting screen, so that cleaner lead paste slurry is obtained.
2. The production process for recycling sodium sulfate from lead ingots prepared by lead plaster according to claim 1, which is characterized in that: the lead plaster slurry is conveyed into a reduction conversion reaction kettle through reduction conversion of the lead plaster, oxalic acid-sulfuric acid is added, the pH value is controlled to be between 2 and 4, and stirring is continued; the lead dioxide is converted into lead sulfate, and the reaction time is about 1h;
the chemical reaction equation is:
PbO 2 +H 2 C 2 O 4 +H 2 SO 4 ＝PbSO 4 +2H 2 O+2CO 2 。
3. the production process for recycling sodium sulfate from lead ingots prepared by lead plaster according to claim 2, which is characterized in that: the lead sulfate slurry enters a desulfurization reaction kettle, sodium hydroxide is added to adjust the pH to 8-10, stirring is continuously carried out at normal temperature and normal pressure, and the lead sulfate reacts with the sodium hydroxide.
4. The production process for recycling sodium sulfate from lead ingots prepared by lead plaster according to claim 3, which is characterized in that: because the lead hydroxide which is a desulfurization product and is produced in the desulfurization process is easy to wrap on the surface of lead sulfate to form a shell layer, the further contact of the lead sulfate and sodium hydroxide is blocked to form a mass transfer barrier, the lead sulfate is not thoroughly reacted, the lead plaster is forcedly updated and desulfurized, the shell surface is forcedly updated and timely ground by adopting compressed air, the shell layer of the product is destroyed, the surface updating of reaction particles is realized, the reaction time is about 30-40min, and at the moment, the solid substance in the solution is lead hydroxide; the pH value is kept between 8 and 10 in the lead plaster desulfurization process.
5. The production process for recycling sodium sulfate from lead ingots prepared by lead plaster according to claim 1, which is characterized in that: the filter pressing comprises the step of pumping the slurry completely reacted in the lead plaster desulfurization reaction kettle into a high-pressure plate-and-frame filter press by a pump to filter, and the step of conveying the sodium sulfate-containing solution into a crystallization process by a pipeline, wherein lead hydroxide solids remain in the plate-and-frame filter press to complete solid-liquid separation.
6. The production process for recycling sodium sulfate from lead ingots prepared by lead plaster according to claim 1, which is characterized in that: the solid-phase electrolysis comprises the steps of placing lead hydroxide subjected to filter pressing on a grid plate of a stainless steel cabinet type cathode frame, wherein an anode is a stainless steel plate, and conducting electrolysis by passing constant-voltage current-limiting direct current into 60-150 g/L sodium hydroxide solution, wherein the temperature is kept at 50-70 ℃, and the constant-voltage value is 1.7-2.5V; the constant voltage electrolysis current is increased from small to peak value, gradually decreases to be stable, and under the condition that the electrolysis parameters are basically unchanged, the current is reduced to 15-35% of the peak value, hydrogen bubbles appear on the surface of cathode lead, and the end point can be judged; taking out the cathode frame, and discharging the reduced lead powder; the electrolytic reaction principle is as follows:
and (3) cathode: 2Pb (OH) 2 +4e＝2Pb+4OH - E 0 ＝-0.516V
Anode: 4OH - -4e＝O 2 +2H 2 O E 0 ＝0.401V。
7. The production process for recycling sodium sulfate from lead ingots prepared by lead plaster according to claim 1, which is characterized in that: the cryopan heating includes: the heating temperature is controlled to be 326-340 ℃ and slightly higher than the melting point of 327 ℃ for 0.5h, the electrolytic lead in the low-temperature pot is heated to be in a molten (softened) state, the boiling point of the lead is 1750 ℃, lead vapor escapes when the low-temperature pot is heated to 400-500 ℃, the lead vapor is rapidly oxidized into lead oxide smoke in the air, the highest heating temperature of the item is 340 ℃, the heating time is 0.5h, the electrolytic lead in the pot is in the molten (softened) state, and little lead oxide dust is generated.
8. The production process for recycling sodium sulfate from lead ingots prepared by lead plaster according to claim 1, which is characterized in that: the spindle handle control of the hydraulic extruder is as follows: and (3) feeding the heated and melted (softened) electrolytic lead into a die from the bottom of the low-temperature pot, and conveying the die to a hydraulic extruder for calendaring to obtain lead ingots.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311547092.0A CN117587461A (en) | 2023-11-20 | 2023-11-20 | Production process for recycling sodium sulfate from lead ingot prepared from lead plaster |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311547092.0A CN117587461A (en) | 2023-11-20 | 2023-11-20 | Production process for recycling sodium sulfate from lead ingot prepared from lead plaster |
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| Publication Number | Publication Date |
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| CN117587461A true CN117587461A (en) | 2024-02-23 |
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| CN202311547092.0A Withdrawn CN117587461A (en) | 2023-11-20 | 2023-11-20 | Production process for recycling sodium sulfate from lead ingot prepared from lead plaster |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118028903A (en) * | 2024-04-11 | 2024-05-14 | 矿冶科技集团有限公司 | Method for preparing lead particles by two-stage suspension electrolysis of waste lead plaster |
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2023
- 2023-11-20 CN CN202311547092.0A patent/CN117587461A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118028903A (en) * | 2024-04-11 | 2024-05-14 | 矿冶科技集团有限公司 | Method for preparing lead particles by two-stage suspension electrolysis of waste lead plaster |
| CN118028903B (en) * | 2024-04-11 | 2024-06-28 | 矿冶科技集团有限公司 | Method for preparing lead particles by two-stage suspension electrolysis of waste lead plaster |
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Application publication date: 20240223 |